public class Test {
    public static void main(String[] args) {
        int count=0;
        for (int i = 1; i < 100; i++) {
            if(i%10==9)
            {
                count++;
            }
            if(i/10==9)
            {
                count++;
            }
        }
        System.out.println(count);
    }
}
